661275576 has 160 divisors (see below), whose sum is σ = 2081993760. Its totient is φ = 194565888.

The previous prime is 661275547. The next prime is 661275577. The reversal of 661275576 is 675572166.

661275576 is a `hidden beast` number, since 6 + 6 + 1 + 2 + 75 + 576 = 666.

661275576 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661275577) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 192046 + ... + 195458.

It is an arithmetic number, because the mean of its divisors is an integer number (13012461).

Almost surely, 2^661275576 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661275576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1040996880).

661275576 is an abundant number, since it is smaller than the sum of its proper divisors (1420718184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661275576 is a wasteful number, since it uses less digits than its factorization.

661275576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3467 (or 3454 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The square root of 661275576 is about 25715.2790379572. The cubic root of 661275576 is about 871.2193129157.

The spelling of 661275576 in words is "six hundred sixty-one million, two hundred seventy-five thousand, five hundred seventy-six".